Pneumatic tire and method of manufacturing the same

Abstract

A pneumatic tire capable of eliminating the need of repairing puncture on the outside of a car and effectively preventing air leakage without accompanying an increase in weight and deterioration of riding comfortableness which occur in a conventional punctureless tire and a method of manufacturing the pneumatic tire, the pneumatic tire characterized in that a rubber-like thin-film formed of a latex dry thin-film in which 20 to 50 wt % rubber component is liquid isoprene rubber and having a breaking elongation of 900% or more and a tensile strength of 15 MPa or higher is disposed on the inner surface of the tire.

1 . A pneumatic tire, comprising: 
 a rubber-like thin-film disposed on an inner surface of the tire, the rubber-like thin-film being formed of a latex dry thin-film in which 20 to 50 wt % rubber component is liquid isoprene rubber and having a breaking elongation of not less than 900% and a tensile strength of not lower than 15 MPa.    
   
   
       2 . The pneumatic tire according to  claim 1 , wherein a thickness of the rubber-like thin-film is not more than 2.0 mm.  
   
   
       3 . The pneumatic tire according to  claim 1 , wherein a molecular weight range of the liquid isoprene rubber is 20,000 to 40,000.  
   
   
       4 . The pneumatic tire according to  claim 1 , wherein a mold release agent is interposed between the rubber-like thin-film and the inner surface of the tire.  
   
   
       5 . A method of manufacturing a pneumatic tire including a rubber-like thin-film on an inner surface of the tire, the rubber-like thin-film having a breaking elongation of not less than 900% and a tensile strength of not lower than 15 MPa, the method comprising: 
 poring latex in which 20 to 50 wt % rubber component is liquid isoprene rubber into the tire vulcanized; and    drying the latex while rotating the tire to form the rubber-like thin-film composed of a dry thin-film of the latex on the inner surface of the tire.    
   
   
       6 . The method of manufacturing a pneumatic tire according to  claim 5 , wherein a thickness of the rubber-like thin-film is not more than 2.0 mm.  
   
   
       7 . The method of manufacturing a pneumatic tire according to  claim 5 , wherein a molecular weight range of the liquid isoprene rubber is 20,000 to 40,000.  
   
   
       8 . The method of manufacturing a pneumatic tire according to  claim 5 , wherein a mold release agent is interposed between the rubber-like thin-film and the inner surface of the tire.